Donald Trump said he wants to see Boris Johnson and Nigel Farage “come together” as he weighed into British politics again.
The US President told reporters at the White House that both men were friends of his, but Johnson was "the right man for the time."
It comes after Mr Farage announced on Sunday that he would not run for a seat in parliament in Britain's snap election on December 12, focusing instead on campaigning against Mr Johnson's EU divorce deal.
Asked which UK leader he supported, Mr Trump said, "I like them both. I think Boris will get it right. They're both friends of mine. What I'd like to see is for Nigel and Boris to come together. I think that's a possibility."
Mr Trump also said Britain's exit from the EU must be structured to facilitate continued trade between Britain and the United States.
"We're far and away the No.1 economy in the world, and if you do it a certain way we're prohibited from trading with the UK," he said. "That would be very bad for the UK, because we can do much more business (than the) European Union."
Mr Trump first waded into Britain's election campaign last week, telling Mr Farage in a radio interview that the leader of the left-wing opposition Labour Party, Jeremy Corbyn, would be "so bad" for Britain if he wins.
Mr Trump also floated the idea that Mr Johnson and Mr Farage could combine forces, saying it could be "terrific."
"If you and he get together it's, you know, unstoppable force," he told Mr Farage in the interview.
Mr Farage responded by saying he would be "right behind" Mr Johnson, on condition the prime minister dropped the Brexit divorce deal he struck with the European Union two weeks ago and instead went for a "clean break" Brexit without a deal.
The president also said Britain could do four to five times more trade with the United States, but might be prevented from doing a bilateral trade deal by the terms of the potential post-Brexit trade relationship that London and Brussels have set out.
